# Build Something Agents Want

> A machine-first catalog of the same software entities, with capability matrices, SKILL.md, and open Twin Score data.

This file follows llmstxt.org. Google Search ignores llms.txt (it will not help or harm Google rankings). Other AI systems may use it as a map.

A Twin Score is two editorial numbers from 0 to 100 — one for the human product surface, one for the agent/API surface — assigned by named staff on a public rubric. AggregateRating in JSON-LD is only those staff composites. We do not ship fake UGC reviews.

## When to use this site
- You need editorial Twin Scores, capability matrices, or SKILL.md for famous software products
- You need a CC BY 4.0 dataset of those scores
- You need OpenAPI at /openapi.json and RFC 9457 errors
- You need server-rendered HTML (H1, first-paragraph answer, JSON-LD) even if the visual layer is a 3D canvas

## When not to use this site
- You want crowdsourced star ratings or invented user counts
- You want an MCP server we did not ship
- You want Argentina-only or city-page spam; this catalog is worldwide English

## Key facts
- Editor: Edu Tor (https://buildsomethingpeoplewant.com/authors/edu-tor)
- Twin sites share product slugs. People = magazine prose. Agents = matrices, SKILL.md, dataset.
- Methodology: https://buildsomethingagentswant.com/methodology
- Rubric: https://buildsomethingagentswant.com/scorecard
- Dataset (CC BY 4.0): https://buildsomethingagentswant.com/dataset/twin-scores.json and https://buildsomethingagentswant.com/dataset/twin-scores.csv
- AI crawlers are allowed in /robots.txt (GPTBot, OAI-SearchBot, ClaudeBot, PerplexityBot, Google-Extended, and others)
- Request Accept: text/markdown for a text/markdown; charset=utf-8 representation of canonical pages

## Twin
People: https://buildsomethingpeoplewant.com
Agents: https://buildsomethingagentswant.com
Developer resources: https://buildsomethingagentswant.com/for-agents (title: Build Something Agents Want developer resources)

## Public API
- JSON list: https://buildsomethingagentswant.com/api/v1/products
- JSON product: https://buildsomethingagentswant.com/api/v1/products/{slug}
- JSON reviews: https://buildsomethingagentswant.com/api/v1/reviews
- OpenAPI: https://buildsomethingagentswant.com/openapi.json
- API catalog: https://buildsomethingagentswant.com/.well-known/api-catalog
- Errors: RFC 9457 application/problem+json with code, detail, and status (400/404/405 on /api/v1/*)

## Key pages
- [Methodology](https://buildsomethingagentswant.com/methodology)
- [Twin Score rubric](https://buildsomethingagentswant.com/scorecard)
- [Products](https://buildsomethingagentswant.com/products)
- [Editorial policy](https://buildsomethingpeoplewant.com/editorial-policy)
- [About](https://buildsomethingagentswant.com/about)
- [AI catalog](https://buildsomethingagentswant.com/.well-known/ai-catalog.json)
- [OpenAPI](https://buildsomethingagentswant.com/openapi.json)
- [JSON API](https://buildsomethingagentswant.com/api/v1/products)
- [Agent skills index](https://buildsomethingagentswant.com/.well-known/agent-skills/index.json)
- [SKILL.md example](https://buildsomethingagentswant.com/skills/chatgpt)

## Products
- [ChatGPT](https://buildsomethingagentswant.com/products/chatgpt): Twin Score human 88, agent 90 · [SKILL.md](https://buildsomethingagentswant.com/skills/chatgpt)
- [Claude](https://buildsomethingagentswant.com/products/claude): Twin Score human 86, agent 92 · [SKILL.md](https://buildsomethingagentswant.com/skills/claude)
- [Gemini](https://buildsomethingagentswant.com/products/gemini): Twin Score human 82, agent 88 · [SKILL.md](https://buildsomethingagentswant.com/skills/gemini)
- [Grok](https://buildsomethingagentswant.com/products/grok): Twin Score human 74, agent 70 · [SKILL.md](https://buildsomethingagentswant.com/skills/grok)
- [Perplexity](https://buildsomethingagentswant.com/products/perplexity): Twin Score human 85, agent 78 · [SKILL.md](https://buildsomethingagentswant.com/skills/perplexity)
- [Microsoft Copilot](https://buildsomethingagentswant.com/products/microsoft-copilot): Twin Score human 80, agent 76 · [SKILL.md](https://buildsomethingagentswant.com/skills/microsoft-copilot)
- [Midjourney](https://buildsomethingagentswant.com/products/midjourney): Twin Score human 84, agent 42 · [SKILL.md](https://buildsomethingagentswant.com/skills/midjourney)
- [Runway](https://buildsomethingagentswant.com/products/runway): Twin Score human 81, agent 64 · [SKILL.md](https://buildsomethingagentswant.com/skills/runway)
- [ElevenLabs](https://buildsomethingagentswant.com/products/elevenlabs): Twin Score human 83, agent 88 · [SKILL.md](https://buildsomethingagentswant.com/skills/elevenlabs)
- [Character.AI](https://buildsomethingagentswant.com/products/character-ai): Twin Score human 72, agent 35 · [SKILL.md](https://buildsomethingagentswant.com/skills/character-ai)
- [Cursor](https://buildsomethingagentswant.com/products/cursor): Twin Score human 90, agent 84 · [SKILL.md](https://buildsomethingagentswant.com/skills/cursor)
- [GitHub](https://buildsomethingagentswant.com/products/github): Twin Score human 91, agent 94 · [SKILL.md](https://buildsomethingagentswant.com/skills/github)
- [GitHub Copilot](https://buildsomethingagentswant.com/products/github-copilot): Twin Score human 84, agent 72 · [SKILL.md](https://buildsomethingagentswant.com/skills/github-copilot)
- [Visual Studio Code](https://buildsomethingagentswant.com/products/vs-code): Twin Score human 93, agent 80 · [SKILL.md](https://buildsomethingagentswant.com/skills/vs-code)
- [GitLab](https://buildsomethingagentswant.com/products/gitlab): Twin Score human 82, agent 90 · [SKILL.md](https://buildsomethingagentswant.com/skills/gitlab)
- [Vercel](https://buildsomethingagentswant.com/products/vercel): Twin Score human 88, agent 87 · [SKILL.md](https://buildsomethingagentswant.com/skills/vercel)
- [Netlify](https://buildsomethingagentswant.com/products/netlify): Twin Score human 80, agent 82 · [SKILL.md](https://buildsomethingagentswant.com/skills/netlify)
- [Linear](https://buildsomethingagentswant.com/products/linear): Twin Score human 92, agent 86 · [SKILL.md](https://buildsomethingagentswant.com/skills/linear)
- [Jira](https://buildsomethingagentswant.com/products/jira): Twin Score human 61, agent 84 · [SKILL.md](https://buildsomethingagentswant.com/skills/jira)
- [Replit](https://buildsomethingagentswant.com/products/replit): Twin Score human 83, agent 75 · [SKILL.md](https://buildsomethingagentswant.com/skills/replit)
- [Notion](https://buildsomethingagentswant.com/products/notion): Twin Score human 87, agent 83 · [SKILL.md](https://buildsomethingagentswant.com/skills/notion)
- [Coda](https://buildsomethingagentswant.com/products/coda): Twin Score human 78, agent 74 · [SKILL.md](https://buildsomethingagentswant.com/skills/coda)
- [Airtable](https://buildsomethingagentswant.com/products/airtable): Twin Score human 84, agent 88 · [SKILL.md](https://buildsomethingagentswant.com/skills/airtable)
- [Figma](https://buildsomethingagentswant.com/products/figma): Twin Score human 94, agent 77 · [SKILL.md](https://buildsomethingagentswant.com/skills/figma)
- [Framer](https://buildsomethingagentswant.com/products/framer): Twin Score human 86, agent 58 · [SKILL.md](https://buildsomethingagentswant.com/skills/framer)
- [Webflow](https://buildsomethingagentswant.com/products/webflow): Twin Score human 85, agent 72 · [SKILL.md](https://buildsomethingagentswant.com/skills/webflow)
- [Canva](https://buildsomethingagentswant.com/products/canva): Twin Score human 89, agent 63 · [SKILL.md](https://buildsomethingagentswant.com/skills/canva)
- [Adobe Creative Cloud](https://buildsomethingagentswant.com/products/adobe-creative-cloud): Twin Score human 83, agent 60 · [SKILL.md](https://buildsomethingagentswant.com/skills/adobe-creative-cloud)
- [Adobe Firefly](https://buildsomethingagentswant.com/products/adobe-firefly): Twin Score human 79, agent 70 · [SKILL.md](https://buildsomethingagentswant.com/skills/adobe-firefly)
- [Superhuman](https://buildsomethingagentswant.com/products/superhuman): Twin Score human 88, agent 40 · [SKILL.md](https://buildsomethingagentswant.com/skills/superhuman)
- [Slack](https://buildsomethingagentswant.com/products/slack): Twin Score human 86, agent 90 · [SKILL.md](https://buildsomethingagentswant.com/skills/slack)
- [Microsoft Teams](https://buildsomethingagentswant.com/products/microsoft-teams): Twin Score human 73, agent 82 · [SKILL.md](https://buildsomethingagentswant.com/skills/microsoft-teams)
- [Zoom](https://buildsomethingagentswant.com/products/zoom): Twin Score human 84, agent 80 · [SKILL.md](https://buildsomethingagentswant.com/skills/zoom)
- [Loom](https://buildsomethingagentswant.com/products/loom): Twin Score human 87, agent 55 · [SKILL.md](https://buildsomethingagentswant.com/skills/loom)
- [Discord](https://buildsomethingagentswant.com/products/discord): Twin Score human 85, agent 88 · [SKILL.md](https://buildsomethingagentswant.com/skills/discord)
- [Cal.com](https://buildsomethingagentswant.com/products/cal-com): Twin Score human 82, agent 85 · [SKILL.md](https://buildsomethingagentswant.com/skills/cal-com)
- [Calendly](https://buildsomethingagentswant.com/products/calendly): Twin Score human 84, agent 70 · [SKILL.md](https://buildsomethingagentswant.com/skills/calendly)
- [Grammarly](https://buildsomethingagentswant.com/products/grammarly): Twin Score human 86, agent 48 · [SKILL.md](https://buildsomethingagentswant.com/skills/grammarly)
- [Stripe](https://buildsomethingagentswant.com/products/stripe): Twin Score human 84, agent 96 · [SKILL.md](https://buildsomethingagentswant.com/skills/stripe)
- [Supabase](https://buildsomethingagentswant.com/products/supabase): Twin Score human 86, agent 93 · [SKILL.md](https://buildsomethingagentswant.com/skills/supabase)

## Articles
- [Human vs agent software surfaces in 2026: original Twin Score research](https://buildsomethingpeoplewant.com/blog/human-vs-agent-software-surfaces-2026)
- [How the Twin Score rubric actually works](https://buildsomethingpeoplewant.com/blog/how-twin-score-rubric-works)
- [Fake UGC is an SEO tactic that this directory refuses](https://buildsomethingpeoplewant.com/blog/fake-ugc-editorial-policy)
- [The capability matrix agents actually need](https://buildsomethingpeoplewant.com/blog/agent-capability-matrix-2026)
- [What is-agentic publishing means for a product directory](https://buildsomethingpeoplewant.com/blog/is-agentic-publishing-directory)
- [ChatGPT vs Claude vs Gemini vs Perplexity vs Grok for real work in 2026](https://buildsomethingpeoplewant.com/blog/chatgpt-vs-claude-vs-gemini-2026)
- [Human advantage versus agent advantage: a gap table from 72 products](https://buildsomethingpeoplewant.com/blog/twin-score-gap-table-2026)

## Optional
- Full map: https://buildsomethingagentswant.com/llms-full.txt
- Dataset: https://buildsomethingagentswant.com/dataset/twin-scores.json
- OpenAPI: https://buildsomethingagentswant.com/openapi.json
- Other twin: https://buildsomethingpeoplewant.com